Astragalus nevinii is a rare species of milkvetch known by the common name San Clemente Island milkvetch. It is endemic to San Clemente Island, one of the Channel Islands of California. This is perennial herb growing upright 10to tall. It is coated in woolly, tangled hairs. Its leaves are up to 8cm (03inches) long and are made up of many oblong leaflets. The inflorescence is a dense cluster of up to 30 cream-colored flowers, each around 1cm (00inches) in length. The fruit is a hanging legume pod up to 2cm (01inches) long which is papery in texture and mostly hairless.